With conditional comments

Congratulations. You are not using IE.

Without conditional comments

You are using IE older than 6

You are using IE 6

You are using IE 7

You are using IE 8

Congratulations. You are not using IE.

The HTML

<!--[if IE 5.5]>
 <div class="fivefive">
  <p>You are using <abbr title="Internet Explorer">IE</abbr> older than 6</p>		
 </div>
<![endif]-->

<!--[if IE 6]>
 <div class="six">	
  <p>You are using <abbr title="Internet Explorer">IE</abbr> 6</p>
 </div>
<![endif]-->

<!--[if IE 7]>
 <div class="seven">
  <p>You are using <abbr title="Internet Explorer">IE</abbr> 7</p>
 </div>
<![endif]-->

<!--[if IE 8]>
 <div class="eight">
  <p>You are using <abbr title="Internet Explorer">IE</abbr> 8</p>
 </div>
<![endif]-->

<!--[if !IE]><!-->
 <div class="good">
  <p>Congratulations. You are <em>not</em> using <abbr title="Internet Explorer">IE</abbr>.</p>
 </div>
<!-- <![endif]-->